There have been at least how many mass extinctions over the course of 570 million years?
A) 15
B) 2
C) 7
D) 20
E) 12
Correct Answer:
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Q7: Scientists estimate that around 10,000 year ago,
Q8: The study of _ shows that there
Q9: If we see life ultimately as a
Q10: _ is the most significant contributor to
Q11: The least amount of ice that is
Q13: Human impact on local environments increases dramatically
Q14: In the arctic, the greatest amount of
Q15: Modern humans beings are the result of
A)biocultural
Q16: _ and _ have allowed us to
Q17: Without sea ice in the summer, _
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